Fortnite is regularly brining new content and fixing existing bugs with new updates. The next one is patch 21.51, a new major for the season and will be available on September 7, 2022.
Regarding its release time, maintenance will begin at 10 a.m., with matchmaking stopping at 9:30 a.m. The patch will not yet be available at the start of the maintenance, it will take a few hours before it is released.
Downloading the patch will be mandatory to be able to play Fortnite. To download it, you have to go to the Epic Games launcher at the end of maintenance. The update will be offered to you when you attempt to launch Fortnite or will be automatically downloaded depending on your saved preferences.
Once downloaded, you will be able to play Fortnite again with the new features brought by the patch!